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210mm f/9 Graphic Kowa - Image Circle

Greetings,

I know there are at least two varieties of the Graphic Kowa 210mm f/9 lens... 4/4 element 4/6 element versions. Does anyone know the usable image circle of one or the other? By "usable" I mean very high quality.

Re: 210mm f/9 Graphic Kowa - Image Circle

Thank you, Lynn. I removed the front/rear cells and viewed the reflections and saw 4/4. However, I didn't think about how many cells may be cemented... I'm getting very forgetful these days. Is there a way to see the optical construction without having to remove the elements from the cells? I no longer trust my hands to not damage the glass.

Re: 210mm f/9 Graphic Kowa - Image Circle

Thank you, Zaitz. I did see that thread. However, I've read other threads and web pages that state a 210mm Computar doesn't always equal a 210mm Graphic Kowa and not all 210mm Graphic Kowas are the same. I'm trying to clear up my confusion which ain't easy at my age.

Re: 210mm f/9 Graphic Kowa - Image Circle

Yeah I've wondered that too, especially after reading that thread. I do know, so far, I haven't seen any real vignetting with my Kowa on 8x10. Someone buy me a Chamonix 12x20 and I'll test it on that .

My websiteFlickr
"There is little or no ‘reality’ in the blacks, grays and whites of either the informational or expressive black-and-white image" -Ansel Adams

Re: 210mm f/9 Graphic Kowa - Image Circle

I haven't run any formal tests either but I do have a few scanned photos that should tell me. I'll have to check when I get off work. I didn't see anything while processing that would make me think the corners were anything but sharp.

My websiteFlickr
"There is little or no ‘reality’ in the blacks, grays and whites of either the informational or expressive black-and-white image" -Ansel Adams